| Bleaching agents |
Mean |
S.D. |
Min. |
Max. |
dt |
|
Control group (no bleaching) |
121.56 |
30.39 |
71.34 |
234.33 |
b |
| Opalescence 20% CP |
172.31 |
19.32 |
114.08 |
297.12 |
a |
| Opalescence10% CP |
160.54 |
33.72 |
90.5 |
291.34 |
a |
| Zoom 25% HP |
154.86 |
32.9 |
95.29 |
288.13 |
a |
S.D.=Standard deviation; dt = Duncan’s Multiple Range Test.
Means with the same letter within each column are not significantly different at
p≤0.05 |
